$\"\"$

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The vectors are $\"\"$ and $\"\"$ .

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End points of the vectors are $\"\"$ and $\"\"$ .

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Calculate the length of the three sides.

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$\"\"$ .

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$\"\"$ .

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$\"\"$ . $\"\"$

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law of cosines: $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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Angle between the vectors is $\"\"$ .